Stereotype casting machine



March l, 1932. J. T, MAMAN 1,847,521

STEREOTYPE CASTING- MACHINE J. T. MAHAN vMarch 1, 1932'.

STEREOTYPE CASTING MACHINE Filed Aug. 2, 1950 v 2 Sheets-Sheet 2 Al u Patented Mar. 1, r1932 UNITED STATES PATENT ol-Flc-E JAMES T. MAHAN, OF AKRON, OHIO STEREOT'YPE CASTING MACHINE Application led August 2, 1930. Serial No. 472,504.

The present invention relates to new and useful improvements in stereotype casting machines and particularly to such machines as are used in newspaper or similar work.

The object of the invention is to improve upon the design and operation of the machine to secure better and more accurate formation of the plates and to compensate for or rectify inequalities in the matrices.

In the operation of casting stereotypes, it is quite vfrequent for the matrix to be formed inaccurately lor to vary in size due t unequal shrinkage, and it is the object of the present A invention to redesign the casting machine in such a manner as to compensate for such irregularities in the matrix. The purpose of the invention is secured in an economical and efficient manner as will `be more fully explained, it being understood that the linvention is not necessarily limited to the detailed construction which has ben illustrated herein. Changes and modifications may be made in specific embodiments of the invention Without sacrificing any of the benefits thereof.

In the drawings in which the best known or preferred form of the invention has been illustrated Figure lis a vertical section of a stereotype casting machine with the improvements located thereon, the view illustrating the plate cast within the mold, the section of the view being indicated by line 1-1 of Figure 2;

Figure 2 is a plan view thereof;

Figure 3 is a detail view of the supportingand operating means for the-apron or pouring sheet;

Figure 4 is an enlarged sectional view taken at the upper edge of the matrix, this view being! located at approximately the center of the sheet;

Figure 5 is a similar view taken at or near the edge of the pouring sheet; f

Figure 6 is a side view of the lower edge of the apron or pouring sheet;

Figure 7 is a view illustrating the faulty work which is encountered when the matrix is too short and when the pouring sheet is not properly located; and

Figure 8 is a similar view showing the faulty work done when the matrix is too long and thev pouring sheet not properly located.

It has not been thought necessary to illustrate or describe the mechanism of the stereotype casting machine, except insofar as it relates to the invention here described, and'it will be understood that such parts as do not directly bear upon the invention have been omitted.

rFhe numeral l indicates the fixed head or block which, in the machine illustrated herein, is semi-cylindrical and is water-cooled. The numeral 2 indicates the movable half ringsupport on which is mounted the half ring 3 which forms the bottom of the pouring or casting cavity and' which clamps the matrix 6 atits lower edge, the rrear of the matrix being supported by the fixed head.

T he numeral 8 represents the movable core which forms the front wall of the cavity.

` The matrix extends from the lower halfv ring to a point along the fixed head and is held and clamped along its upper edge by the pouring sheet or apron l0 which overlaps the upper edge of the matrix just above ure 6 and be slightly spaced therefrom as L shown at b in the same figure.

In orderto secure perfect results in casting of the stereotype plates, it is essential thatthe edge of the pouring sheet be accurately located with respect to the'edge of the matrix, and this result is often not possible where the lower edge of the sheet is always located at fixed points. If the matrix has shrunk too greatly or is not quite long enough, the edge of the matrix will tend to bulge outwardly, as shown inl Figure 7 and an imperfect printing edge will vbe secured along the line c.` If the matrix be too long, the rib. 11 will be fiattened'by the pouring sheet and in this case also an imperfect printing edge e will be obtained, as shown in Y place between blocks or washers 18. Each ences and variations in the matrices.

shaft y16 is rotatably mounted in a. sleeve 2O having an angular screw threaded extension 2l. Fixed on the head are the two brackets 23 in which is located the horizontal shaft 24, the ends of which are extended beyond the brackets on either side of the machine and have fixed arms 2 5 depending therefrom in alignment with the extensions 21. Turnbucltles 26 connect the parts 21 and 25 and. by Vthese means the pouring sheet is suspended, the turnbuclrles permitting the length of veither or both of the pouring sheet supports to be adjusted. Loch nuts 28 mainT tain the parts in their adj usted positions.

@ne of .the `shafts 16 is provided with the operating handleA 30 by which the pouring sheet may be swung into or out of operative position. In order to assist in elevating the pouring sheet, the shaft 2e is provided at one end with an arm 32 to which is attached the spring 33 fixed at its opposite end to a bracket 34: on the head. An adjustable tie-rod 35 may be used to connect the brackets.

. By the mechanism which has been described, it is possible to compensate for variations-in the length of the matrices and secure perfectu castings at all times, the position of the lower edge of the pouring apron or sheet being accurately located by varying the length of the arms 21-25 which support the pouring sheet. It is also possible to tilt the lower edge of the pouring sheet so as t0 secure the accurate positioning thereof not only along` the edge of the sheet, but at the points @and as well. rllhe spout for pouring the metal is indicated at a0.

i he invention which has been illustrated Aand described effects a very considerable economy in the operation of stereotype casting` machines. It affords a means not heretofore provided for compensating for differ- It is very helpful to the casting of perfect printing plates and is a valuable addition to ma.-

chincs of the typev and kind illustrated herein.

lt may also be used to advantage on other forms of casting machines where a pouring sheet or apron is employed.

rVfhat is claimed-is: Y

1. A stereotype casting machine comprising ahead, a movable core, a matrix support at the base of the cavity between the head and the core,-.a pouring sheetmovable into the cavity, a support `from which the pouring sheet is suspended at spaced points so that its lower edge-overlaps the matrix, and individually adjustable members on said` support `whereby the lower edgeof the pouring she-et may be located with respect to varying matrices.

2. A stereotype casting machine comprisinga head, a movable core, a matrix support at the base 0f the cavity between the head and the core, a pouring sheet, a support for the pouring sheet, and lengthwise adjustable means for suspending the sheet from the support.

' 3. A stereotype casting machine comprising a casting cavity, a` support for the lower edge of the matrix in the cavity, a sheet adapted to overlap the matrix along its upper edge, shafts to support the sheet adjacent the upper corners thereof, a bearing shaft located above the cavity, and lengthwise adjustable links extending from the bearing shaft tothe first named shafts. l

4. in a stereotype casting machine, a sheet overlapping the upper edge of a matrix in the cavity, a fixed lsupport for the sheet, and variable means for suspending the sheet from the fixed support.

ln a stereotype casting machine, a sheet overl pping the upper edge of a matrix in the cavity, fixed support for the sheet, and independently variable means 'for suspending the -cornersof the sheet from the fixed support. f G. n a stereotype castino machine, a sheet overlepping:` the upper edge of a matrix in the cavity, a .fixed sha-ft above the cavity, 'swinging'` linltson the shaft byfwhich the sheet is suspended, and adjustable mechanism locatedY in said .links for varying the effective length thereof.

JAMns- T. MAHAN. 

